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        <title>1.2 Hive 优缺点 · 大数据 bigdata_hive_atguigu 课堂笔记</title>
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        <li class="chapter " data-level="1.1" data-path="./">
            
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                    第 1 章 Hive 概述
            
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        <li class="chapter " data-level="1.1.1" data-path="11-shi-yao-shi-hive.html">
            
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                    1.1 什么是 Hive
            
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        <li class="chapter active" data-level="1.1.2" data-path="12-hive-you-que-dian.html">
            
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                    1.2 Hive 优缺点
            
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        <li class="chapter " data-level="1.1.3" data-path="13-hive-jia-gou-yuan-li.html">
            
                <a href="13-hive-jia-gou-yuan-li.html">
            
                    
                    1.3 Hive 架构原理
            
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        <li class="chapter " data-level="1.1.4" data-path="14-hive-he-shu-ju-ku-bi-jiao.html">
            
                <a href="14-hive-he-shu-ju-ku-bi-jiao.html">
            
                    
                    1.4 Hive 和数据库比较
            
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        <li class="chapter " data-level="1.2" data-path="chapter1.html">
            
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                    第 2 章 hive 安装和基本操作
            
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        <li class="chapter " data-level="1.2.1" data-path="chapter1/21-xia-zai-hive.html">
            
                <a href="chapter1/21-xia-zai-hive.html">
            
                    
                    2.1 下载 Hive
            
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        <li class="chapter " data-level="1.2.2" data-path="chapter1/22-an-zhuang-hive.html">
            
                <a href="chapter1/22-an-zhuang-hive.html">
            
                    
                    2.2 安装 Hive
            
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        <li class="chapter " data-level="1.2.3" data-path="chapter1/23-hive-ji-ben-pei-zhi.html">
            
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                    2.3 Hive 基本配置
            
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        <li class="chapter " data-level="1.2.4" data-path="chapter1/24-qi-dong-hive.html">
            
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                    2.4 运行 Hive
            
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        <li class="chapter " data-level="1.2.5" data-path="chapter1/25-hive-ji-ben-cao-zuo.html">
            
                <a href="chapter1/25-hive-ji-ben-cao-zuo.html">
            
                    
                    2.5 Hive 基本操作
            
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        <li class="chapter " data-level="1.2.6" data-path="chapter1/26-dao-ru-wen-jian-dao-biao-zhong.html">
            
                <a href="chapter1/26-dao-ru-wen-jian-dao-biao-zhong.html">
            
                    
                    2.6 导入文件到表中
            
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        <li class="chapter " data-level="1.2.7" data-path="chapter1/27-pei-zhi-mysql-fu-wu-qi.html">
            
                <a href="chapter1/27-pei-zhi-mysql-fu-wu-qi.html">
            
                    
                    2.7 配置 Mysql 服务器
            
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        <li class="chapter " data-level="1.2.7.1" data-path="chapter1/27-pei-zhi-mysql-fu-wu-qi/271-hive-wei-sha-xu-yao-pu-tong-de-shu-ju-ku.html">
            
                <a href="chapter1/27-pei-zhi-mysql-fu-wu-qi/271-hive-wei-sha-xu-yao-pu-tong-de-shu-ju-ku.html">
            
                    
                    2.7.1 Hive 为啥需要普通的数据库
            
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        <li class="chapter " data-level="1.2.7.2" data-path="di-8-zhang-hive-zheng-he-mysql/102-wei-sha-yao-yong-mysql.html">
            
                <a href="di-8-zhang-hive-zheng-he-mysql/102-wei-sha-yao-yong-mysql.html">
            
                    
                    2.7.2 为啥要用 Mysql
            
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        <li class="chapter " data-level="1.2.7.3" data-path="di-8-zhang-hive-zheng-he-mysql/103-an-zhuang-mysql.html">
            
                <a href="di-8-zhang-hive-zheng-he-mysql/103-an-zhuang-mysql.html">
            
                    
                    2.7.3 安装 Mysql
            
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        <li class="chapter " data-level="1.2.7.4" data-path="di-8-zhang-hive-zheng-he-mysql/104-hive-zhong-de-yuan-shu-ju-pei-zhi-dao-mysql.html">
            
                <a href="di-8-zhang-hive-zheng-he-mysql/104-hive-zhong-de-yuan-shu-ju-pei-zhi-dao-mysql.html">
            
                    
                    2.7.4 Hive 中的元数据配置到 Mysql
            
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        <li class="chapter " data-level="1.2.8" data-path="chapter1/27-hive-qi-ta-chang-yong-ming-ling.html">
            
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                    2.8 HIve 其他常用命令
            
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        <li class="chapter " data-level="1.2.9" data-path="chapter1/28-hive-chang-jian-shu-xing-pei-zhi.html">
            
                <a href="chapter1/28-hive-chang-jian-shu-xing-pei-zhi.html">
            
                    
                    2.9 Hive 常见属性配置
            
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            </ul>
            
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        <li class="chapter " data-level="1.3" data-path="di-3-zhang-chang-yong-shu-ju-lei-xing.html">
            
                <a href="di-3-zhang-chang-yong-shu-ju-lei-xing.html">
            
                    
                    第 3 章 常用数据类型
            
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        <li class="chapter " data-level="1.3.1" data-path="di-3-zhang-chang-yong-shu-ju-lei-xing/31-ji-ben-shu-ju-lei-xing.html">
            
                <a href="di-3-zhang-chang-yong-shu-ju-lei-xing/31-ji-ben-shu-ju-lei-xing.html">
            
                    
                    3.1 基本数据类型
            
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        <li class="chapter " data-level="1.3.2" data-path="di-3-zhang-chang-yong-shu-ju-lei-xing/32-ji-he-shu-ju-lei-xing.html">
            
                <a href="di-3-zhang-chang-yong-shu-ju-lei-xing/32-ji-he-shu-ju-lei-xing.html">
            
                    
                    3.2 复杂数据类型
            
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        <li class="chapter " data-level="1.3.3" data-path="di-3-zhang-chang-yong-shu-ju-lei-xing/33-lei-xing-de-zhuan-huan.html">
            
                <a href="di-3-zhang-chang-yong-shu-ju-lei-xing/33-lei-xing-de-zhuan-huan.html">
            
                    
                    3.3 类型的转换
            
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        <li class="chapter " data-level="1.4" data-path="di-4-zhang-ddl-shu-ju-ding-yi.html">
            
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                    第 4 章 DDL 数据定义
            
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        <li class="chapter " data-level="1.4.1" data-path="di-4-zhang-ddl-shu-ju-ding-yi/41-chuang-jian-shu-ju-ku.html">
            
                <a href="di-4-zhang-ddl-shu-ju-ding-yi/41-chuang-jian-shu-ju-ku.html">
            
                    
                    4.1 数据库相关 DDL 操作
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.2" data-path="di-4-zhang-ddl-shu-ju-ding-yi/42-biao-ji-ben-ddl-cao-zuo.html">
            
                <a href="di-4-zhang-ddl-shu-ju-ding-yi/42-biao-ji-ben-ddl-cao-zuo.html">
            
                    
                    4.2 表 DDL 操作:创建表和删除表
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.3" data-path="di-4-zhang-ddl-shu-ju-ding-yi/43-biao-ddl-cao-4f5c3a-xiu-gai-biao.html">
            
                <a href="di-4-zhang-ddl-shu-ju-ding-yi/43-biao-ddl-cao-4f5c3a-xiu-gai-biao.html">
            
                    
                    4.3 表 DDL 操作: 修改表
            
                </a>
            

            
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        <li class="chapter " data-level="1.4.4" data-path="di-4-zhang-ddl-shu-ju-ding-yi/44-nei-bu-biao-he-wai-bu-biao.html">
            
                <a href="di-4-zhang-ddl-shu-ju-ding-yi/44-nei-bu-biao-he-wai-bu-biao.html">
            
                    
                    4.4 内部表和外部表
            
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        <li class="chapter " data-level="1.4.5" data-path="di-4-zhang-ddl-shu-ju-ding-yi/45-fen-qu-biao.html">
            
                <a href="di-4-zhang-ddl-shu-ju-ding-yi/45-fen-qu-biao.html">
            
                    
                    4.5 分区表
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5" data-path="di-5-zhang-dml-shu-ju-cao-zuo.html">
            
                <a href="di-5-zhang-dml-shu-ju-cao-zuo.html">
            
                    
                    第 5 章 DML 数据操作
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1" data-path="di-5-zhang-dml-shu-ju-cao-zuo/51-shu-ju-dao-ru.html">
            
                <a href="di-5-zhang-dml-shu-ju-cao-zuo/51-shu-ju-dao-ru.html">
            
                    
                    5.1 数据导入表
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2" data-path="di-5-zhang-dml-shu-ju-cao-zuo/52-shu-ju-dao-chu.html">
            
                <a href="di-5-zhang-dml-shu-ju-cao-zuo/52-shu-ju-dao-chu.html">
            
                    
                    5.2 数据从表中导出
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.3" data-path="di-5-zhang-dml-shu-ju-cao-zuo/53-qing-kong-biao-zhong-de-shu-ju.html">
            
                <a href="di-5-zhang-dml-shu-ju-cao-zuo/53-qing-kong-biao-zhong-de-shu-ju.html">
            
                    
                    5.3 清空表中的数据
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6" data-path="di-7-zhang-han-shu.html">
            
                <a href="di-7-zhang-han-shu.html">
            
                    
                    第 7 章 函数
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1" data-path="di-7-zhang-han-shu/71-xi-tong-nei-zhi-han-shu.html">
            
                <a href="di-7-zhang-han-shu/71-xi-tong-nei-zhi-han-shu.html">
            
                    
                    7.1 系统内置函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.2" data-path="di-7-zhang-han-shu/72-zi-ding-yi-han-shu.html">
            
                <a href="di-7-zhang-han-shu/72-zi-ding-yi-han-shu.html">
            
                    
                    7.2 自定义函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.3" data-path="di-7-zhang-han-shu/73-zi-ding-yi-udf-han-shu.html">
            
                <a href="di-7-zhang-han-shu/73-zi-ding-yi-udf-han-shu.html">
            
                    
                    7.3 自定义 UDF 函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.7" data-path="di-6-zhang-cha-xun.html">
            
                <a href="di-6-zhang-cha-xun.html">
            
                    
                    第 6 章 查询
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.7.1" data-path="di-6-zhang-cha-xun/61-ji-ben-cha-xun.html">
            
                <a href="di-6-zhang-cha-xun/61-ji-ben-cha-xun.html">
            
                    
                    6.1 基本查询
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.2" data-path="di-6-zhang-cha-xun/62-where-yu-ju.html">
            
                <a href="di-6-zhang-cha-xun/62-where-yu-ju.html">
            
                    
                    6.2 where 语句
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.3" data-path="di-6-zhang-cha-xun/63-fen-zu.html">
            
                <a href="di-6-zhang-cha-xun/63-fen-zu.html">
            
                    
                    6.3 分组
            
                </a>
            

            
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        <li class="chapter " data-level="1.7.4" data-path="di-6-zhang-cha-xun/64-join-yu-ju.html">
            
                <a href="di-6-zhang-cha-xun/64-join-yu-ju.html">
            
                    
                    6.4 join 语句
            
                </a>
            

            
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        <li class="chapter " data-level="1.7.5" data-path="di-6-zhang-cha-xun/65-pai-xu.html">
            
                <a href="di-6-zhang-cha-xun/65-pai-xu.html">
            
                    
                    6.5 排序
            
                </a>
            

            
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        <li class="chapter " data-level="1.7.6" data-path="di-6-zhang-cha-xun/66-fen-tong-he-chou-yang-cha-xun.html">
            
                <a href="di-6-zhang-cha-xun/66-fen-tong-he-chou-yang-cha-xun.html">
            
                    
                    6.6 分桶和抽样查询
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.7" data-path="di-6-zhang-cha-xun/67-duo-xing-zhuan-lie-cha-xun.html">
            
                <a href="di-6-zhang-cha-xun/67-duo-xing-zhuan-lie-cha-xun.html">
            
                    
                    6.7 多行转列查询
            
                </a>
            

            
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        <li class="chapter " data-level="1.7.8" data-path="di-6-zhang-cha-xun/57-lie-zhuan-xing-cha-xun.html">
            
                <a href="di-6-zhang-cha-xun/57-lie-zhuan-xing-cha-xun.html">
            
                    
                    5.7 列转行查询
            
                </a>
            

            
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        <li class="chapter " data-level="1.7.9" data-path="di-6-zhang-cha-xun/58-chuang-kou-han-shu.html">
            
                <a href="di-6-zhang-cha-xun/58-chuang-kou-han-shu.html">
            
                    
                    5.8 窗口查询
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.10" data-path="di-6-zhang-cha-xun/581-rank-han-shu.html">
            
                <a href="di-6-zhang-cha-xun/581-rank-han-shu.html">
            
                    
                    5.8_1 rank 函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.11" data-path="di-6-zhang-cha-xun/59-gei-null-zi-duan-fu-zhi.html">
            
                <a href="di-6-zhang-cha-xun/59-gei-null-zi-duan-fu-zhi.html">
            
                    
                    5.9 给 NULL 字段赋值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.7.12" data-path="di-6-zhang-cha-xun/510-case-when.html">
            
                <a href="di-6-zhang-cha-xun/510-case-when.html">
            
                    
                    5.10 case when
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.8" data-path="di-8-zhang-ya-suo-he-cun-chu.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu.html">
            
                    
                    第 8 章 压缩和存储
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.8.1" data-path="di-8-zhang-ya-suo-he-cun-chu/81-bian-yi-hadoop-yuan-ma.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/81-bian-yi-hadoop-yuan-ma.html">
            
                    
                    8.1 编译 Hadoop 源码
            
                </a>
            

            
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        <li class="chapter " data-level="1.8.2" data-path="di-8-zhang-ya-suo-he-cun-chu/82-ya-suo-pei-zhi.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/82-ya-suo-pei-zhi.html">
            
                    
                    8.2 压缩配置
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.3" data-path="di-8-zhang-ya-suo-he-cun-chu/83-kai-qi-map-jie-duan-shu-chu-ya-suo.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/83-kai-qi-map-jie-duan-shu-chu-ya-suo.html">
            
                    
                    8.3 开启 Map 阶段输出压缩
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.4" data-path="di-8-zhang-ya-suo-he-cun-chu/84-kai-qi-reduce-shu-chu-jie-duan-ya-suo.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/84-kai-qi-reduce-shu-chu-jie-duan-ya-suo.html">
            
                    
                    8.4 开启 Reduce 输出阶段压缩
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.5" data-path="di-8-zhang-ya-suo-he-cun-chu/85-wen-jian-cun-chu-ge-shi.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/85-wen-jian-cun-chu-ge-shi.html">
            
                    
                    8.5 文件存储格式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.6" data-path="di-8-zhang-ya-suo-he-cun-chu/85-zhu-liu-wen-jian-ge-shi-dui-bi-shi-yan.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/85-zhu-liu-wen-jian-ge-shi-dui-bi-shi-yan.html">
            
                    
                    8.5 主流文件格式对比实验
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.8.7" data-path="di-8-zhang-ya-suo-he-cun-chu/86-cun-chu-he-ya-suo-de-jie-he.html">
            
                <a href="di-8-zhang-ya-suo-he-cun-chu/86-cun-chu-he-ya-suo-de-jie-he.html">
            
                    
                    8.6 存储和压缩的结合
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.9" data-path="di-9-zhang-qi-ye-ji-diao-you.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you.html">
            
                    
                    第 9 章 企业级调优
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.9.1" data-path="di-9-zhang-qi-ye-ji-diao-you/91-fetch.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/91-fetch.html">
            
                    
                    9.1 Fetch 抓取
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.2" data-path="di-9-zhang-qi-ye-ji-diao-you/92-ben-di-mo-shi.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/92-ben-di-mo-shi.html">
            
                    
                    9.2 本地模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua.html">
            
                    
                    9.3 表的优化
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.9.3.1" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/931-xiao-biao-he-da-biao-join.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/931-xiao-biao-he-da-biao-join.html">
            
                    
                    9.3.1 小表和大表 join
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.2" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/932-kong-key-you-hua.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/932-kong-key-you-hua.html">
            
                    
                    9.3.2 空 key 过滤
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.3" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/933-kong-key-zhuan-huan.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/933-kong-key-zhuan-huan.html">
            
                    
                    9.3.3 空 key 转换
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.4" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/934-map-join.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/934-map-join.html">
            
                    
                    9.3.4 map join
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.5" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/935-group-by-you-hua.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/935-group-by-you-hua.html">
            
                    
                    9.3.5 group by 优化
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.6" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/936-countdistinct-qu-zhong-kong-jian.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/936-countdistinct-qu-zhong-kong-jian.html">
            
                    
                    9.3.6 count(distinct) 去重统计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.7" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/937-bi-mian-di-qia-er-ji.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/937-bi-mian-di-qia-er-ji.html">
            
                    
                    9.3.7 避免笛卡尔积
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.8" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/938-xing-lie-guo-lv.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/938-xing-lie-guo-lv.html">
            
                    
                    9.3.8 行列过滤
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.9" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/939-dong-tai-fen-qu-diao-zheng.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/939-dong-tai-fen-qu-diao-zheng.html">
            
                    
                    9.3.9 动态分区调整
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.3.10" data-path="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/9310-fen-qu-he-fen-tong.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/93-biao-de-you-hua/9310-fen-qu-he-fen-tong.html">
            
                    
                    9.3.10 分区和分桶
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.9.4" data-path="di-9-zhang-qi-ye-ji-diao-you/94-shu-ju-qing-xie.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/94-shu-ju-qing-xie.html">
            
                    
                    9.4 数据倾斜
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.5" data-path="di-9-zhang-qi-ye-ji-diao-you/95-bing-xing-zhi-xing.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/95-bing-xing-zhi-xing.html">
            
                    
                    9.5 并行执行
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.6" data-path="di-9-zhang-qi-ye-ji-diao-you/96-yan-ge-mo-shi.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/96-yan-ge-mo-shi.html">
            
                    
                    9.6 严格模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.7" data-path="di-9-zhang-qi-ye-ji-diao-you/97-jvm-zhong-yong.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/97-jvm-zhong-yong.html">
            
                    
                    9.7 JVM 重用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.8" data-path="di-9-zhang-qi-ye-ji-diao-you/98-tui-ce-zhi-xing.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/98-tui-ce-zhi-xing.html">
            
                    
                    9.8 推测执行
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.9" data-path="di-9-zhang-qi-ye-ji-diao-you/99-shu-ju-ya-suo.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/99-shu-ju-ya-suo.html">
            
                    
                    9.9 数据压缩
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.9.10" data-path="di-9-zhang-qi-ye-ji-diao-you/91-fetch-zhua-qu.html">
            
                <a href="di-9-zhang-qi-ye-ji-diao-you/91-fetch-zhua-qu.html">
            
                    
                    9.10 执行计划
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.10" data-path="di-11-zhang-hive-shi-zhan.html">
            
                <a href="di-11-zhang-hive-shi-zhan.html">
            
                    
                    第 11 章 Hive 实战之谷粒影音
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.10.1" data-path="di-11-zhang-hive-shi-zhan/111-xu-qiu-miao-shu.html">
            
                <a href="di-11-zhang-hive-shi-zhan/111-xu-qiu-miao-shu.html">
            
                    
                    11.1 需求描述
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.2" data-path="di-11-zhang-hive-shi-zhan/112-shu-ju-jie-gou.html">
            
                <a href="di-11-zhang-hive-shi-zhan/112-shu-ju-jie-gou.html">
            
                    
                    11.2 数据结构
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.3" data-path="di-11-zhang-hive-shi-zhan/113-zhun-bei-gong-zuo.html">
            
                <a href="di-11-zhang-hive-shi-zhan/113-zhun-bei-gong-zuo.html">
            
                    
                    11.3 准备工作
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi.html">
            
                    
                    11.4 业务分析
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.10.4.1" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1141-tong-ji-shi-pin-guan-kan-shu-top10.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1141-tong-ji-shi-pin-guan-kan-shu-top10.html">
            
                    
                    11.4.1 统计视频观看数 Top10
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4.2" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1142-tong-ji-shi-pin-lei-bie-re-du-top10.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1142-tong-ji-shi-pin-lei-bie-re-du-top10.html">
            
                    
                    11.4.2 统计视频类别热度 Top10
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4.3" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1143-tong-ji-chu-shi-pin-guan-kan-shu-zui-gao-de-20-ge-shi-pin-de-suo-shu-lei-bie-yi-ji-lei-bie-bao-han-top20-shi-pin-de-ge-shu.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1143-tong-ji-chu-shi-pin-guan-kan-shu-zui-gao-de-20-ge-shi-pin-de-suo-shu-lei-bie-yi-ji-lei-bie-bao-han-top20-shi-pin-de-ge-shu.html">
            
                    
                    11.4.3 统计出视频观看数最高的20个视频的所属类别以及类别包含Top20视频的个数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4.4" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1144-tong-ji-shi-pin-guan-kan-shu-top50-suo-guan-lian-shi-pin-de-suo-shu-lei-bie-rank.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1144-tong-ji-shi-pin-guan-kan-shu-top50-suo-guan-lian-shi-pin-de-suo-shu-lei-bie-rank.html">
            
                    
                    11.4.4 统计视频观看数Top50所关联视频的所属类别 Rank
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4.5" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1145-tong-ji-mei-ge-lei-bie-zhong-de-shi-pin-re-du-top10.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1145-tong-ji-mei-ge-lei-bie-zhong-de-shi-pin-re-du-top10.html">
            
                    
                    11.4.5 统计每个类别中的视频热度 Top10
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4.6" data-path="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1146-tong-ji-mei-ge-lei-bie-zhong-shi-pin-liu-liang-top10.html">
            
                <a href="di-11-zhang-hive-shi-zhan/114-ye-wu-fen-xi/1146-tong-ji-mei-ge-lei-bie-zhong-shi-pin-liu-liang-top10.html">
            
                    
                    11.4.6 统计每个类别中视频流量Top10
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.4.7" data-path="di-11-zhang-hive-shi-zhan/1147-tong-ji-shang-chuan-shi-pin-zui-duo-de-yong-hu-top10-yi-ji-ta-men-shang-chuan-de-guan-kan-ci-shu-zai-qian-20-de-shi-pin.html">
            
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                    11.4.7 统计上传视频最多的用户 Top10 以及他们上传的观看次数在前 20 的视频
            
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        </li>
    

            </ul>
            
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                                <h1 id="12-hive-&#x4F18;&#x7F3A;&#x70B9;&#x5206;&#x6790;">1.2 Hive &#x4F18;&#x7F3A;&#x70B9;&#x5206;&#x6790;</h1>
<h2 id="121-&#x4F18;&#x70B9;">1.2.1 &#x4F18;&#x70B9;</h2>
<ol>
<li><p>&#x64CD;&#x4F5C;&#x4F7F;&#x7528; HiveQL(&#x975E;&#x5E38;&#x7C7B;&#x4F3C;&#x4E8E; SQL)&#x8BED;&#x6CD5;, &#x5BF9;&#x5F00;&#x53D1;&#x4EBA;&#x5458;&#x6765;&#x8BF4;&#x6BD4;&#x8F83;&#x7B80;&#x5355;, &#x5BB9;&#x6613;&#x4E0A;&#x624B;, &#x63D0;&#x4F9B;&#x5FEB;&#x901F;&#x5F00;&#x53D1;&#x7684;&#x80FD;&#x529B;.</p>
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<li><p>&#x57FA;&#x4E8E; Hadoop &#x6784;&#x5EFA;, &#x6240;&#x4EE5;&#x975E;&#x5E38;&#x9002;&#x5408;&#x5904;&#x7406;&#x5927;&#x6279;&#x91CF;&#x7684;&#x6570;&#x636E;, &#x5E76;&#x4E14;&#x8FD9;&#x4E9B;&#x6570;&#x636E;&#x7684;&#x5904;&#x7406;&#x5BF9;&#x5B9E;&#x65F6;&#x6027;&#x7684;&#x8981;&#x6C42;&#x4E0D;&#x9AD8;.</p>
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<li><p>&#x4F7F;&#x7528; Hive &#x907F;&#x514D;&#x4E86;&#x5199; MapReduce, &#x964D;&#x4F4E;&#x4E86;&#x5F00;&#x53D1;&#x4EBA;&#x5458;&#x7684;&#x5B66;&#x4E60;&#x6210;&#x672C;, &#x548C;&#x5F00;&#x53D1;&#x96BE;&#x5EA6;.</p>
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<li><p>Hive &#x652F;&#x6301;&#x7528;&#x6237;&#x81EA;&#x5B9A;&#x4E49;&#x51FD;&#x6570;, &#x7528;&#x6237;&#x53EF;&#x4EE5;&#x6839;&#x636E;&#x81EA;&#x5DF1;&#x7684;&#x5B9E;&#x9645;&#x9700;&#x6C42;&#x6765;&#x81EA;&#x5DF1;&#x5B9A;&#x4E49;&#x76F8;&#x5E94;&#x7684;&#x529F;&#x80FD;&#x51FD;&#x6570;.</p>
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<p>&#x603B;&#x7ED3;: <my>&#x4F7F;&#x7528; HiveQL &#x8BED;&#x8A00;, &#x6765;&#x5904;&#x7406;&#x5BF9;&#x5EF6;&#x8FDF;&#x6CA1;&#x6709;&#x8981;&#x6C42;&#x7684;&#x5927;&#x91CF;&#x6570;&#x636E;.</my> &#x6BD4;&#x5982;:&#x7F51;&#x7EDC;&#x8BBF;&#x95EE;&#x65E5;&#x5FD7;&#x7684;&#x5206;&#x6790;.</p>
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<h2 id="122-&#x7F3A;&#x70B9;">1.2.2 &#x7F3A;&#x70B9;</h2>
<ol>
<li><p>Hive &#x7684; HiveQL &#x8868;&#x8FBE;&#x80FD;&#x529B;&#x6709;&#x9650;</p>
<ul>
<li>&#x8FED;&#x4EE3;&#x7B97;&#x6CD5;&#x65E0;&#x6CD5;&#x8868;&#x8FBE;</li>
<li>&#x6570;&#x636E;&#x6316;&#x6398;&#x65B9;&#x4FBF;&#x4E0D;&#x64C5;&#x957F;</li>
</ul>
</li>
<li><p>&#x7531;&#x4E8E; Hadoop &#x901A;&#x5E38;&#x6709;&#x8F83;&#x9AD8;&#x7684;&#x5EF6;&#x8FDF;&#x5E76;&#x4E14;&#x5728;&#x4F5C;&#x4E1A;&#x548C;&#x8C03;&#x5EA6;&#x7684;&#x65F6;&#x5019;&#x9700;&#x8981;&#x5927;&#x91CF;&#x7684;&#x5F00;&#x9500;, &#x6240;&#x4EE5; Hive &#x7684;&#x6267;&#x884C;&#x6548;&#x7387;&#x76F8;&#x5BF9;&#x8F83;&#x4F4E;.</p>
<ul>
<li>&#x4E0D;&#x9002;&#x5408;&#x8981;&#x6C42;&#x5EF6;&#x8FDF;&#x6BD4;&#x8F83;&#x7684;&#x573A;&#x666F;. &#x6BD4;&#x5982;&#x4E3A;&#x4E86;&#x5904;&#x7406;&#x5728;&#x7EBF;&#x4E8B;&#x52A1;.</li>
<li>Hive &#x81EA;&#x52A8;&#x751F;&#x6210;&#x7684; MapReduce &#x4F5C;&#x4E1A;&#x901A;&#x5E38;&#x60C5;&#x51B5;&#x4E0B;&#x5E76;&#x4E0D;&#x667A;&#x80FD;, &#x4E0D;&#x80FD;&#x6EE1;&#x8DB3;&#x590D;&#x6742;&#x573A;&#x666F;.</li>
<li>Hive &#x8C03;&#x4F18;&#x6BD4;&#x8F83;&#x56F0;&#x96BE;, &#x7C92;&#x5EA6;&#x6BD4;&#x8F83;&#x7C97;.</li>
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